U.S. patent application number 15/749822 was filed with the patent office on 2018-08-16 for ceramic bone cutter.
The applicant listed for this patent is CeramTec GmbH. Invention is credited to Mateusz JUSZCZYK, Andreas REMPP, Heinrich Alan WECKER.
Application Number | 20180228499 15/749822 |
Document ID | / |
Family ID | 56611258 |
Filed Date | 2018-08-16 |
United States Patent
Application |
20180228499 |
Kind Code |
A1 |
WECKER; Heinrich Alan ; et
al. |
August 16, 2018 |
CERAMIC BONE CUTTER
Abstract
The invention relates to a cutting broaching tool (1) for
intraoperatively obtaining bone material from a patient, comprising
a main part (3) which rotates about a rotational axis (2) for
securing on a rotating tool support and comprising at least one
blade (4) which is rigidly connected to the main part (3). The aim
of the invention is to prevent the tissue from reacting when using
the broaching tool and thus prevent an increased risk of infection,
to prevent a thermal load on the bone, to receive the bone material
in the interior of the broaching tool, and to discharge the bone
material to an external device. This is achieved in that the main
part (3) has a cylindrical shape, is hollow, and surrounds a first
cavity (5). The blade (4) or all the blades (4) are formed
integrally with the main part (3), extend in the direction of the
rotational axis (2) of the main part (3) at a distance from an end
face (6) of the main part (3), and surround a second cavity (7).
The first cavity (5) is connected to the second cavity (7) in order
to receive and transport the cut bone material, and the broaching
tool (1) is made of a sintered ceramic material.
Inventors: |
WECKER; Heinrich Alan;
(Eckental, DE) ; REMPP; Andreas; (Ostfildern,
DE) ; JUSZCZYK; Mateusz; (Velden, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CeramTec GmbH |
Plochingen |
|
DE |
|
|
Family ID: |
56611258 |
Appl. No.: |
15/749822 |
Filed: |
August 3, 2016 |
PCT Filed: |
August 3, 2016 |
PCT NO: |
PCT/EP2016/068506 |
371 Date: |
February 2, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61B 2017/0088 20130101;
A61B 2017/1602 20130101; A61B 17/1637 20130101 |
International
Class: |
A61B 17/16 20060101
A61B017/16 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 4, 2015 |
DE |
10 2015 009 857.8 |
Claims
1. A cutting broaching tool for intraoperatively obtaining bone
material from a patient, comprising a main part which rotates about
a rotational axis for securing on a rotating tool support and
comprising at least one blade which is rigidly connected to the
main part, wherein, a. the main part has a cylindrical shape and is
hollow, and surrounds a first cavity, b. the blade or all of the
blades are formed integrally with the main part, extend in the
direction of the rotational axis of the main part at a distance
from an end face of the main part, and surround a second cavity, c.
the first cavity is connected to the second cavity in order to
receive and transport the cut bone material and d. the broaching
tool is made of a sintered ceramic material.
2. A broaching tool according to claim 1, wherein the broaching
tool comprises of a sintered oxide or nitrite ceramic.
3. A broaching tool according to claim 1, wherein at least one of
the blades extends beyond the rotational axis for submerging into
the bone and so cuts beyond the rotational axis.
4. A broaching tool according to claim 1, wherein the blade or all
of the blades open into an annular tip with a transverse bore and
the transverse bore is connected with the second cavity.
5. A broaching tool according to claim 1, wherein the blades are
curved in the rotational direction of the broaching tool and thus
only a section of all of the blades cuts simultaneously.
6. A broaching tool according to claim 1, wherein a transverse bore
is arranged in the main part for securing on the tool support.
7. A broaching tool according to claim 1, wherein the broaching
tool comprises of four blades.
8. A broaching tool according to claim 1, wherein reinforced areas
are arranged in the rotational direction behind the cutting edges
of the blades.
Description
[0001] The invention relates to a cutting broaching tool for
intraoperatively obtaining bone material from a patient, comprising
a main part which rotates about a rotational axis for securing on a
rotating tool support and comprising at least one blade which is
rigidly connected to the main part.
[0002] In certain application cases during surgical operations on
the human body, the patient's own bone material, known as bone
chips, is required. It is known that a metal broaching tool is used
for this that comprises a main part that rotates about its own
rotational axis for securing on a rotating tool support and
comprising at least one blade which is rigidly connected to the
main part.
[0003] A disadvantage of the known broaching tools is that tissue
reactions with the broaching tool can occur and an increased risk
of infections exists as a result of this and a thermal load on the
bone can be caused due to the friction during cutting. Furthermore,
the broaching tool should be reusable following sterilization.
[0004] The object of the invention is to propose a cutting
broaching tool in accordance with the generic term of Claim 1,
which prevents the indicated disadvantages. Furthermore, the
broaching tool should receive the bone material inside and also
have the possibility of transporting it to an external device.
[0005] According to the object of the invention, this task is
achieved by means of a cutting broaching tool in accordance with
the characteristics of Claim 1.
[0006] Because the main part has a cylindrical shape and is hollow,
and surrounds a first cavity, because the blade or all of the
blades are formed integrally with the main part, extend in the
direction of the rotational axis of the main part at a distance
from an end face of the main part, and surround a second cavity,
because the first cavity is connected to the second cavity in order
to receive and transport the cut bone material, and because the
broaching tool is made of a sintered ceramic material, tissue
reactions are prevented because sintered ceramic materials are
inert. The risk of infection is significantly less compared with
metal broaching tools. Ceramic surfaces facilitate sterilization,
ensuring that the broaching tool can be reused. The embodiment of
the broaching tool with the two interior cavities that merge with
each other makes it possible to remove the bone material or the
bone chips. This is particularly advantageous in the case of an
increased volume of bone material.
[0007] Using the sintered ceramic materials dramatically increases
the hardness of the broaching tool compared with known metal
broaching tools. This results in the blade's longer service life
and a clean cut. The limited friction results in a reduced thermal
load on the bone. Tissue reactions are ruled out.
[0008] The broaching tool is preferably comprised of a sintered
oxide or nitride ceramic. This has proven its worth in joint
surgery.
[0009] To facilitate easier incision, at least one of the blades
extends beyond the rotational axis for submerging into the bone and
so cuts beyond the rotational axis.
[0010] In one embodiment, the blade or all of the blades open into
an annular tip with a transverse bore and the transverse bore is
connected with the second cavity. The annular tip gives the blades
the necessary stability and facilitates a blade cutting beyond the
rotational axis.
[0011] To ensure an even incision when cutting and no abrupt
engaging of blade to blade occurs when cutting, the blades are
curved in the rotational direction of the broaching tool and thus
only a section of all of the blades cuts simultaneously. All the
blades have the same curvature. All of the blades have the same
contour.
[0012] To secure the main part to a tool support, it is preferred
that a cross bore is arranged in the main part.
[0013] In an embodiment, the broaching tool comprises of four
blades. Four blades make particularly uniform cutting possible.
However, 1 to 6 blades are an advantage depending on the individual
application.
[0014] Reinforced areas are preferably arranged in the rotational
direction behind the cutting edges of the blades.
[0015] The broaching tool cuts bones of differing densities using
one or more blades. The thickness of the bone chips created is set
by means of the geometry of the blades.
[0016] The manipulated variables in this case are the blade height
and blade length. The broaching tool receives the cut bone chips
inside and can eject them by means of a hose-like element connected
with the tool.
[0017] The broaching tool is characterized by high hardness, high
rigidity and biocompatibility. It should be produced using sintered
ceramic materials, preferably oxide and nitride ceramic.
[0018] The broaching tool comprises a cylindrical main part that is
hollow and designed as an interface to the tool support. A
preferred embodiment of the blade area is a conical inlet (hollow).
The tip comprises in an embodiment blades that narrow to a point
and a transverse bore.
[0019] In the following the invention is described further using a
preferred embodiment of a broaching tool that is the object of the
invention.
[0020] FIG. 1 shows an external view of a broaching tool that is
the object of the invention and
[0021] FIG. 2 shows a top view, meaning from the point of view of
the rotational axis 2.
[0022] The broaching tool 1 comprises a cylindrical main part 3
that surrounds a first cavity 5. The main part 3 is open top and
bottom. A transverse bore 10 is arranged in the wall of the main
part for securing on a tool support not shown here.
[0023] Blades 4 are arranged on a side of the main part 3 on its
end face 6, that are formed integrally with the main part 3. In the
embodiment shown here it is four blades 4 that extend in the
direction of the rotational axis 2 of the main part 3 at a distance
from one of the end faces 6 of the main part 3, and surround a
second cavity 7. The first cavity 5 in the main part 3 is connected
to the second cavity 7 within the blades 4. In the embodiment shown
here both cavities 5, 7 open into one another to receive and
transport the cut bone material.
[0024] A curved slot 11 is arranged between the blades 4 whose
longitudinal sides are formed by the blades 4. The blades 4 are all
designed the same, wherein one of the blades 4 extends beyond the
rotational axis 2 for submerging into the bone and so cuts beyond
the rotational axis 2.
[0025] The broaching tool 1 comprises of a sintered ceramic
material and is preferably comprised of a sintered oxide or nitride
ceramic.
[0026] All of the blades 4 open into an annular tip 8 that
comprises a transverse bore 9. This transverse bore 9 is connected
with the second cavity 7 or opens into this in this embodiment. The
radial distance of the blades 4 to the rotational axis 2 narrows
continuously from the end face 6 to the tip 8, so that the blades 4
have an approximate conical embodiment.
[0027] The blades 4 are curved in the rotational direction of the
broaching tool 1 and thus only a section of bone is cut by all of
the blades simultaneously.
[0028] In the embodiment shown here reinforced areas 13 are
arranged in the rotational direction behind the cutting edges of
the blades 4.
* * * * *